EP3368347B1 - Agricultural tire - Google Patents

Agricultural tire Download PDF

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Publication number
EP3368347B1
EP3368347B1 EP16790909.2A EP16790909A EP3368347B1 EP 3368347 B1 EP3368347 B1 EP 3368347B1 EP 16790909 A EP16790909 A EP 16790909A EP 3368347 B1 EP3368347 B1 EP 3368347B1
Authority
EP
European Patent Office
Prior art keywords
lug
tread
radial distance
distance
transition point
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP16790909.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3368347A1 (en
Inventor
Mario Sgreccia
Adriano Tedesco
Fabrizio PERETTI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bridgestone Corp filed Critical Bridgestone Corp
Publication of EP3368347A1 publication Critical patent/EP3368347A1/en
Application granted granted Critical
Publication of EP3368347B1 publication Critical patent/EP3368347B1/en
Active legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/0311—Patterns comprising tread lugs arranged parallel or oblique to the axis of rotation
    • B60C11/0316—Patterns comprising tread lugs arranged parallel or oblique to the axis of rotation further characterised by the groove cross-section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
    • B60C11/1376—Three dimensional block surfaces departing from the enveloping tread contour
    • B60C11/1392—Three dimensional block surfaces departing from the enveloping tread contour with chamfered block edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/0311—Patterns comprising tread lugs arranged parallel or oblique to the axis of rotation
    • B60C2011/0313—Patterns comprising tread lugs arranged parallel or oblique to the axis of rotation directional type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C2200/00—Tyres specially adapted for particular applications
    • B60C2200/08—Tyres specially adapted for particular applications for agricultural vehicles

Definitions

  • the present invention pertains to a tread for an agricultural tire and particularly relates to an improved profile of its lugs.
  • a lug, also called a bar, of an agriculture tire is defined as that element protruding from the ground of the tread and coming in contact with the pavement surface when the agriculture tire is operated on roads.
  • a lug is also that element of an agriculture tire engaging with the mud or soil when the agriculture tire is operated on a field. In engaging with the mud or soil the lug provides the necessary traction to allow the longitudinal movement of the tire during its rotation.
  • Usually agriculture tires comprise a plurality of lugs.
  • the shape of the lugs on the tread of the agriculture tire i.e. their inclination angle or curvature towards the circumferential direction of the tire, is one important feature to tune tire performances.
  • further improvement can be achieved in providing a particular geometry of the sidewalls of the lugs, especially of the one of the stepping-in side of the lug, i.e. the one first coming in contact with the soil when the tire is rotating.
  • the geometry of this sidewall is mostly responsible for the traction on soft or muddy soil.
  • EP903249A1 discloses an agricultural pneumatic tire comprising a tread provided with lugs extending at a given inclination angle from a central portion of the tread toward both ends of the tread.
  • the lugs are alternately arranged right and left with respect to an equatorial plane of the tire at given intervals in the circumferential direction of the tire.
  • the same application discloses the sidewall of the stepping-in side of the lug consisting of a first flat surface slanted at a given angle and a second bored or concave surface, which surfaces intersect each other at a given elevation of the total lug height.
  • WO2015015525A1 discloses an agriculture tire comprising a tread provided with a plurality of ribs, each rib being provided with a front wall, wherein, on the front wall of the rib, a shaped profile is present, wherein the shaped profile has a section that defines at least one flat surface of the shaped profile which is parallel, or inclined at an angle a up to 20°, with respect to the surface of the head of the rib.
  • An important additional property of an agriculture tire is its ability of self-cleaning, i.e. the capability of removing the soil from between adjacent lugs on the tread without external intervention.
  • the technical problem underlying the present invention is therefore to provide a tread for agricultural tires allowing optimising tire performances with respect to the known art.
  • the tread of the invention comprises at least one lug with a lug profile improving traction on fields, wear on roads and tire self-cleaning performances at the same time.
  • Such improvement is obtained by a variation of the lug profile along its axial length.
  • the lug profile improves the resistance to digging-in of the lug into mud or soil, thereby increasing the traction performances of the tire.
  • the lug profile also increases the stiffness of the lug, thereby improving its resistance to wear.
  • the present invention encompasses also embodiments of treads wherein one or more lugs have said improved profiles and others have not.
  • lugs having said improved profile can be arranged along the tire circumference as well as on the axially left and right side of the tire alternatingly with lugs having a conventional profile known in the art.
  • tread according to the invention might comprise lugs having different improved profiles, each according to a preferred embodiment of present invention as disclosed in the following.
  • Fig. 1 shows an agricultural tire 1 comprising a tread 10.
  • the latter is provided with a plurality of lugs, one of which is denoted by way of example with 2.
  • Each lug 2 protrudes from a ground 11 of tread 10 in a radially outer direction of the tire.
  • the lugs are alternately arranged at given intervals in the circumferential direction of the tire on one side and on the other with respect to the equatorial plane of the tire.
  • the "equatorial plane" of an agriculture tire is defined as the plane orthogonal to the rotation axis of the tire and passing through the axial middle of the tire.
  • each lug 2 extends from a first end 201 in the axial central part of the tire, i.e. in the area of the equatorial plane, towards a second end 202 in the axial lateral part of the tire, i.e. the shoulder area of the tire.
  • the area close to, and including, the first end 201 of the lug in the central area of the tire defines a so-called nose region, or nose, 22 of the lug.
  • the area close to, and including, the second end 202 of the lug in the shoulder area of the tire is called the shoulder region, or shoulder, 23 of the lug.
  • the lug extends from the nose 22 to the shoulder 23 at a given inclination angle ⁇ with respect to the circumferential direction of the tire, i.e. with respect to said tire equatorial plane.
  • angle ⁇ is defined as the angle between the equatorial plane and a longitudinal axis, or average longitudinal axis, G of lug 2.
  • lug 2 extends from the nose 22 to the shoulder 23 along a curvature.
  • the distance from the first end 201 of the lug to the second end 202 of the lug along the curvature of the lug is called axial length of the lug and is denoted by E.
  • the nose region 22 of a lug 2 is considered the region within about 33%, preferably within 25%, of the axial length E of the lug 2 from the first end 201 along its axial extension
  • the shoulder region 23 of a lug 2 is considered the region within about 33%, preferably within 25%, of the axial length E of the lug 2 from the second end 202 along its axial extension.
  • Each lug 2 has a substantially trapezoidal shape when viewed in a sectional view taken, at any point, in a plane orthogonal to the path connecting the nose 22 with the shoulder 23 along the axial length E.
  • a trapezoidal shape is shown also, for example, in Figure 3 .
  • the central part of the lug 2 included between ends 201 and 202 as well as between the nose region 22 and the shoulder region 23 is denoted by 27.
  • each lug 2 of the tread 10 sequentially comes in contact with the ground or engages the soil or mud.
  • the first part of each lug 2 that comes in contact with the ground is the one in the central part of the tread 10, i.e. the nose 22 of the lug 2.
  • the central part 27 of the lug 2 comes in contact with the ground.
  • the part of the lug on the axially outer side of the tread i.e. the shoulder 23 of the lug 2 comes in contact with the ground.
  • the rotation direction R of the tire consequently defines one side of the lugs that first comes in contact with the mud or soil in a field, the so called stepping-in or leading side 21 of the lug 2.
  • the opposite side of the stepping-in side 21 of the lug in circumferential direction is the so called stepping-out, or trailing, side 24 of the lug 2.
  • Lug 2 also includes a radially outer side 25, defining the lug surface opposite to tread ground 11 and arranged substantially orthogonal to the stepping-in side 21 and stepping-out side 24, these latter sides 21 and 24 being connected one to the other by the radially outer side 25.
  • the radially outer side 25 of the lug delimits the lug in radial outer direction and intersects both the stepping-in side 21 and stepping-out side 24 of the lug.
  • the intersection of the radial outer side 25 with the stepping-in side 21 is called the leading edge L of the lug.
  • the intersection of the radial outer side 25 with the stepping-out side 24 is called the trailing edge T of the lug.
  • Fig. 2 shows a sectional view of the agricultural tire of Fig. 1 taken along the plane A-A of the latter figure. Particularly, in the detail Y, the section of lug 2 with its lug profile according to a preferred embodiment of the invention can be seen.
  • the external profile of the stepping-in side 21 of the lug comprises a first, radially outer, concave surface 211 and a second, radially inner, concave surface 212.
  • the first concave surface 211 and the second concave surface 212 intersect each other at a transition point, or apex, D.
  • the first concave surface 211 intersects the radial outer side 25 of the lug at the leading edge L.
  • the radially inner end of the second concave surface 212 preferably terminates on the ground 11 of the tread surface.
  • a first smoothening radius 213 can be added between the second concave surface 212 and the ground 11 of the tread 10.
  • the external profile of the stepping-out side 24 of the lug shown in Fig. 2 is flat or substantially flat.
  • the transition between the sidewall of the stepping-out side 24 of the lug and the surface of the ground 11 of the tread 10 may be rounded with a second smoothening radius 214.
  • the latter may be equal or different from first smoothening radius 213.
  • both surfaces 211 and 212 are curved, in particular concave, surfaces.
  • each surface 211, 212 develops, at least in each circumferential sectional plane B-B or parallel to B-B, according to a spline curve , i.e. the radius of curvature of each surface 211 and 212 varies along the radial direction.
  • the spline curve of first surface 211 is different from the spline curve of second surface 212.
  • the greatest radius of curvature of the spline curve of each surface 211 and 212 is smaller than 400 mm, preferably smaller than 350 mm and more preferably smaller than 300 mm.
  • each surface 211, 212 develops, at least in each circumferential sectional plane B-B or parallel to B-B, according a constant radius of curvature, being part of a spherical profile.
  • the radius of curvature of each surface 211 and 212 is smaller than 400 mm, preferably smaller than 350 mm and more preferably smaller than 300mm.
  • the height H of the lug 2 is defined as the distance in radial direction of the tire from the ground 11 of the tread 10 to the radially outer side 25.
  • the transition point D is positioned at radial distance h1 from the radial outer side 25 of the lug and is positioned at a radial distance h2 from the ground 11 of the tread 10.
  • the radial distance h1 from the transition point D to the radial outer surface 25 of the lug and the radial distance h2 between the ground 11 of the tread 10 and the transition point D are constant and do not vary along the whole axial length of the lug 2.
  • the radial distance h2 between the ground 11 of the tread 10 and the transition point D is the same as the radial distance h1 from the transition point D to the radial outer surface 25 of the lug.
  • the radial distance h2 between the ground 11 and the transition point D is the same as the radial distance h1 from the transition point D to the radial outer surface 25 of the lug along the whole axial length E of the lug 2.
  • the position on the lug profile of the transition edge D is further defined by the circumferential distance d from a reference plane P, i.e. the distance of edge D from plane P in a direction orthogonal to the lug radial height H.
  • the plane P is the plane connecting the radially outer intersection of the first concave surface 211 with the radial outer surface of the lug 25, i.e. the leading edge L, with the radially inner intersection of the second concave surface 212 with the ground 11.
  • plane P is the plane connecting the radially outer intersection of the first concave surface 211 with the radial outer surface 25 of the lug, i.e. the leading edge L, with the radially inner intersection of the imaginary continuation of the second concave surface 212 with the ground 11 of tread 10.
  • Figure 3b is showing a variant of this preferred embodiment wherein the intersection at the leading edge L is chamfered or flattened as well as wherein a first smoothening radius 213 is provided in the transition area between the second concave surface 212 and the ground of the tread 11.
  • the plane P is the plane connecting the radially outer intersection of the imaginary continuation of the first concave surface 211 with the imaginary continuation of the radial outer surface of the lug 25, i.e. the imaginary leading edge L', with the radially inner intersection of the imaginary continuation of the second concave surface 212 with the ground 11 of the tread 10, i.e. point O in Fig. 3b .
  • the imaginary continuation of the surfaces can be achieved in drawing a circle Ci passing through the following three point: D; the end point Ff of the respective first or second surface 211 or 212; and an intermediate third point Gf defined by the intersection of a plane Mf orthogonal to the line connecting the points D and Ff , such orthogonal plane Mf being positioned at equal distance from D and Ff.
  • Figure 3c is showing by way of example the circle defined by the point D, the end point Ff of the first surface 211 and the intermediate point Gf along the first surface 211.
  • the first concave surface 211 is tangential to the plane P in the leading edge L or in the imaginary leading edge L'.
  • the second concave surface 212 is tangential to the plane P in the point of radially inner intersection of the second concave surface 212 with the ground 11 of the tread 10 or in the point of the radially inner intersection of the imaginary continuation of the second concave surface 212 with the ground 11 of the tread 10.
  • the plane P is inclined with respect to a radial plane passing through the intersection point L or L' and orthogonal to the radial outer surface 25 of the lug at an angle ⁇ .
  • the angle ⁇ is comprised in the range 0° ⁇ ⁇ ⁇ 45°, more preferably in the range 5° ⁇ ⁇ ⁇ 35° and even more preferably in the range 10° ⁇ ⁇ ⁇ 25°
  • the profile of the stepping-in side 21 varies along the axial length E of the lug 2 from the nose 22 to the shoulder 23.
  • the distance d is not constant along the axial length E of the lug 2 from the nose 22 to the shoulder 23 of the lug.
  • the distance d, along the whole axial length E of the lug 2 is comprised in the range 0 x CLW ⁇ d ⁇ 0,5 CLW , more preferably in the range 0 x CLW ⁇ d ⁇ 0,35 CLW and even more preferably in the range 0 x CLW ⁇ d ⁇ 0,25 CLW, wherein CLW is the circumferential width of the lug 2 measured at the radial outer surface 25 of the lug 2 taken in the same circumferential section as the distance d.
  • An exemplary CLW e is shown in Figures 3 and 4 .
  • the distance d is smaller than in the central area 27 of the lug 2 along the axial length of the lug 2 as shown in Figures 4 and 5 .
  • the preferred profile distance d in the nose and shoulder region is in the range d ⁇ 0,25 d max wherein d max is the maximum distance d in the central area 27 of the lug 2.
  • the nose and shoulder regions of the lugs are the so called self-cleaning areas of the lugs.
  • a small distance d in the nose region improves the self-cleaning in such a way that the channelling of the soil or mud in the area between the lugs is improved.
  • the shoulder region of the lug having a reduced profile width with a small distance d improves the self-cleaning by improving the elimination of soil or mud from the tread.
  • the variation of the distance d along the axial length E of the lug 2 from the nose 22 to the shoulder 23 is parabolic and more preferably being zero at the end of the nose and shoulder region, i.e. respectively at the first end 201 and the second end 202, of the stepping-in side 21 of the lug 2. It is understood that other variations of the distance d along the axis of the lug are also encompassed by the present invention.
  • the same profile disclosed for the stepping-in side 21 of lug 2 comprising the two concave surfaces 211 and 212 intersecting at the transition point D can also extend to a front sidewall of the nose 22 of the lug, as shown in Figure 4 .
  • a second and third preferred embodiment according to present invention comprise all the features as described in the previous first preferred embodiment with the exception of the radial position of the transition point D.
  • the radial distance h2 between the ground 11 of the tread 10 and the transition point D is not the same as the radial distance h1 from the transition point D to the radial outer surface 25 of the lug 2 along the whole axial length of the lug 2.
  • h1 as well as h2 vary along the axial length of the lug 2.
  • the radial distance h2 between the ground 11 of the tread 10 and the transition point D is greater than the radial distance h1 from the transition point D to the radial outer surface 25 of the lug 2 and in the nose area 22 of the lug 2 the radial distance h2 between the ground 11 of the tread 10 and the transition point D is smaller than the radial distance h1 from the transition point D to the radially outer surface 25 of the lug 2.
  • the radial distance h1 continuously increases along the axial length E of the lug 2 from the shoulder 23 to the nose 22 whereby the radial distance h2 consequently continuously decreases along the axial length E of the lug 2 from the shoulder 23 to the nose 22 of the lug 2.
  • This embodiment is particularly advantageous in field operating conditions where due to the lower inflation pressure of the agriculture tire 1 there is a higher load distribution in the shoulder areas of the agriculture tire 1 and consequently in the shoulder areas of the lugs.
  • a reduced radial distance h1 on the shoulder i.e. a transition point D closer to the radial outer surface 25 of the lug 2 in the shoulder area, improves the wear resistance in the shoulder area.
  • the radial distance h2 between the ground of the tread 11 and the transition point D varies along the axial length of the lug 2 in a linear way.
  • the radial distance h2 between the ground of the tread 11 and the transition point D varies along the axial length of the lug in a non-linear way, preferably curved or parabolic way.
  • the radial distance h2 between the ground 11 of the tread 10 and the transition point D is smaller than the radial distance h1 from the transition point D to the radial outer surface 25 of the lug 2 and in the nose region the radial distance h2 between the ground 11 of the tread 10 and the transition point D is greater than the radial distance h1 from the transition point D to the radially outer surface 25 of the lug 2.
  • the radial distance h1 continuously decreases along the axial length E of the lug from the shoulder to the nose whereby the radial distance h2 consequently continuously increases along the axial length E of the lug from the shoulder to the nose area.
  • This embodiment is particularly advantageous in road operating conditions where due to the higher inflation pressure of the agriculture tire 1 there is a higher load distribution in the central area of the agriculture tire 1 and consequently of the nose region of the lugs.
  • a reduced radial distance h1 in the nose area, i.e. a transition point D closer to the radially outer surface 25 of the lug 2 in the nose area improves the wear resistance in the central area of the tire.
  • the radial distance h2 between the ground of the tread 11 and the transition point D varies along the axial length E of the lug 2 in a linear way.
  • the radial distance h2 between the ground 11 of the tread 10 and the transition point D varies along the axial length E of the lug 2 in a non-linear way, preferably curved or parabolic way.
  • Transition point D can also be implemented as a thin region instead that as a single point.
  • a junction profile can be applied between the first and the second concave surface.
  • a circular junction may be present, having, in a sectional view like that of Fig. 2 , a radius of curvature comprised in a range of about 0.5-1.0 mm.
  • a tread 10 for agriculture tire 1 might comprise a plurality of lugs wherein the plurality of lugs might comprise different groups of plurality of lugs each group according to different embodiments of present invention alternately arranged on the tread.
  • the same agricultural tire 1 might further comprise also standard lugs known in the art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
EP16790909.2A 2015-10-29 2016-10-20 Agricultural tire Active EP3368347B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUB2015A005089A ITUB20155089A1 (it) 2015-10-29 2015-10-29 Pneumatico agricolo
PCT/EP2016/075180 WO2017072014A1 (en) 2015-10-29 2016-10-20 Agricultural tire

Publications (2)

Publication Number Publication Date
EP3368347A1 EP3368347A1 (en) 2018-09-05
EP3368347B1 true EP3368347B1 (en) 2020-01-15

Family

ID=55273400

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16790909.2A Active EP3368347B1 (en) 2015-10-29 2016-10-20 Agricultural tire

Country Status (6)

Country Link
US (1) US10906357B2 (zh)
EP (1) EP3368347B1 (zh)
CN (1) CN108349317B (zh)
BR (1) BR112018006521B1 (zh)
IT (1) ITUB20155089A1 (zh)
WO (1) WO2017072014A1 (zh)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11572115B2 (en) 2019-07-17 2023-02-07 Srj, Inc. Tread pattern
DE202020100216U1 (de) 2019-11-08 2020-07-17 Apollo Tyres Global R&D B.V. Reifen für landwirtschaftliche Maschine
USD967001S1 (en) * 2020-06-18 2022-10-18 Nokian Heavy Tyres Ltd Tire
USD967002S1 (en) * 2020-06-18 2022-10-18 Nokian Heavy Tyres Ltd Tire
CA214301S (en) * 2020-06-18 2022-11-08 Nokian Heavy Tyres Ltd Tire

Family Cites Families (9)

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Publication number Priority date Publication date Assignee Title
JPS60145902U (ja) * 1984-03-09 1985-09-27 株式会社ブリヂストン 段付きラグタイヤ
JPH09254609A (ja) 1996-03-26 1997-09-30 Ohtsu Tire & Rubber Co Ltd :The ラグ付空気入りタイヤ
JP4864577B2 (ja) 2006-07-10 2012-02-01 住友ゴム工業株式会社 ラグ付き走行体
JP5676202B2 (ja) * 2010-10-04 2015-02-25 株式会社ブリヂストン 農業用タイヤ
BR112013015582B1 (pt) * 2010-12-29 2021-05-18 Pirelli Tyre S.P.A. pneumático
FR2975635B1 (fr) * 2011-05-25 2013-05-24 Michelin Soc Tech Bande de roulement de pneumatique pour tracteur agricole
CN202685791U (zh) * 2012-06-08 2013-01-23 厦门正新橡胶工业有限公司 一种农业轮胎
ITRM20130447A1 (it) * 2013-07-30 2015-01-31 Trelleborg Wheel Sys Italia Spa Pneumatico con migliorate capacita' di trazione.
JP5833197B2 (ja) * 2014-07-14 2015-12-16 株式会社ブリヂストン 農業用タイヤ

Non-Patent Citations (1)

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Also Published As

Publication number Publication date
WO2017072014A1 (en) 2017-05-04
CN108349317A (zh) 2018-07-31
ITUB20155089A1 (it) 2017-04-29
EP3368347A1 (en) 2018-09-05
US10906357B2 (en) 2021-02-02
BR112018006521A2 (pt) 2018-10-16
CN108349317B (zh) 2020-07-14
BR112018006521B1 (pt) 2021-08-24
US20180297415A1 (en) 2018-10-18

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